I'd think the 8 digits will be in dots or asterisks, this is a windows default security no matter how many digit keys you put in,it still shows eight digits only.(My one has 63 digits but shows 8 as well)
If there is a "Show characters" box to tick then you'd see the 10 actual digits with the router.
Are you, by any chance, confusing the password for logging into the router as its administrator (so that you can configure the router), with the password for wireless connection to the router (for the purposes of accesssing the Internet etc.)?
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